minerals

We know donating blood lowers Ferrtin, has anyone checked on RBC minerals such as Magnesium, Zinc, Copper or Iodine before/after? theoretically giving up some red blood cells should lower these minerals correct?

Recently, the media were abuzz again with tales of horror, worthlessness and danger about supplements. It's tiresome for those of us trying to navigate between supplement sales people and the minions of pharma who fear the competition these supplements may represent to often horribly...